简介:研究了碱性条件下Al3+及碱土金属离子(Mg2+、Ca2+)对H2O2的稳定作用、过渡金属离子Fe3+、Fe2+、Mn2+和Cu2+对H2O2的催化分解作用及MgSO4、DTPA和Na2SiO3对碱性H2O2溶液的稳定作用.结果表明,碱土金属离子Mg2+、Ca2+可以对碱性H2O2溶液起到很好的稳定作用;Al3+在强碱条件下对H2O2的分解没有影响.过渡金属离子Fe3+、Fe2+、Mn2+和Cu2+在碱性条件下都会快速催化分解H2O2.4种过渡金属离子对H2O2的催化分解作用由强到弱依次为:Cu2+、Fe2+、Mn2+、Fe3+.在过渡金属离子存在的情况下,Mg2+仍然有较好的防分解性能;Mg2+对有Fe2+存在的H2O2碱溶液的稳定效果好于Fe3+.无论H2O2的碱性溶液中是否有过渡金属离子,加入DTPA对H2O2均有一定的稳定作用,但其稳定效果远不如添加Mg2+效果好.Na2SiO3加入不含过渡金属离子的碱性H2O2溶液中时,不能够起到稳定H2O2的作用.
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简介:РоссийскийспортвгодыВеликойОтечественнойвойныИзвестныйнамкомплексГТО1нетолькопомогалкрепитьобороннуюмощьСССР,ноиоткрывалфеноменальныеспортивныеталанты.
简介:Dibromobiphenylreactedwithcynomethylanioninammoniaunderirradiationtoformnucleophilicbis-substitutedproductinhighyieldwithoutsubstantialmonosubstitutedproduct.Quantumyieldsfortheformationsofbis-andmonosubstitutedproductswerefoundtobe85.6and2.3×10-6respectively,whilethecorrespondingpseudo-first-orderrateswere6.9×10-3and5.2×10-10mol.L-1.S-1.Blockupthepossibleelectrontransferof4-brome-4’-cyanomethylbiphenylylradicalanionto4-cyanometbyl-biphenylylradicalandbromineion.